Hi have you put a spectrum analyser on the rx port and fed, from a signal generator, the tx freq into the aerial input making sure that the tx port is terminated at 50 ohms. What freqs, what split. You need to know just what level is getting to the rx port, it has to be around 70dB rejection or you will allways have some desense
73 Steve ----- Original Message ----- From: "kc0mlt" <kc0...@yahoo.com> To: <Repeater-Builder@yahoogroups.com> Sent: Friday, May 21, 2010 3:28 PM Subject: [Repeater-Builder] Duplexer on the cheap worries > Hello all. > > I am trying to figure out if the duplexer we have put together is up to > the task or not. Here is the situation. We have four cavities 6.5" dia. > one is a vari-notch the others are simple reject cans. Two rejects are on > the TX side and one reject and the vari-notch are on the RX side. All set > and tuned with rg-213 jumpers between cans and RG-142 from the cans to the > Tee connector. We are doing some light testing with a cheap dual ban > antenna on the garage. It is feed with RG-8 about 70 feet. We are having > some issues with receive. It kind of sounds like desense but I think it is > something wrong with the receiver. I was just wondering if the cobbeled > together cans sound like thay are doing a good enough job as a duplexer or > if we do have something to change on it. The repeater is only putting out > 2 watts for testing. I would think I have enough separation for that power > level. Any suggestions or thoughts woyuld be greatly appreciated. > > Thanks > Wade > KC0MLT > > > > > ------------------------------------ > > > > Yahoo! Groups Links > > >
